1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
|
package org.terst.nav
import android.content.Context
import android.graphics.Canvas
import android.graphics.Paint
import android.graphics.Path
import android.util.AttributeSet
import android.view.View
import androidx.core.content.ContextCompat
class BarometerTrendView @JvmOverloads constructor(
context: Context,
attrs: AttributeSet? = null,
defStyleAttr: Int = 0
) : View(context, attrs, defStyleAttr) {
private var history: List<BarometerReading> = emptyList()
private val linePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
color = ContextCompat.getColor(context, R.color.instrument_text_normal)
strokeWidth = 4f
style = Paint.Style.STROKE
strokeCap = Paint.Cap.ROUND
strokeJoin = Paint.Join.ROUND
}
private val gridPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
color = ContextCompat.getColor(context, R.color.instrument_text_secondary)
strokeWidth = 1f
style = Paint.Style.STROKE
}
fun setHistory(newHistory: List<BarometerReading>) {
history = newHistory
invalidate()
}
override fun onDraw(canvas: Canvas) {
super.onDraw(canvas)
if (history.size < 2) return
val padding = 20f
val w = width.toFloat() - 2 * padding
val h = height.toFloat() - 2 * padding
val minP = history.minOf { it.pressureHpa }
val maxP = history.maxOf { it.pressureHpa }
val rangeP = (maxP - minP).coerceAtLeast(1.0f) // Show at least 1 hPa range
val minT = history.first().timestamp
val maxT = history.last().timestamp
val rangeT = (maxT - minT).coerceAtLeast(1L)
// Draw simple grid
canvas.drawLine(padding, padding, padding, h + padding, gridPaint)
canvas.drawLine(padding, h + padding, w + padding, h + padding, gridPaint)
val path = Path()
history.forEachIndexed { index, reading ->
val x = padding + (reading.timestamp - minT).toFloat() / rangeT * w
val y = padding + h - (reading.pressureHpa - minP) / rangeP * h
if (index == 0) {
path.moveTo(x, y)
} else {
path.lineTo(x, y)
}
}
canvas.drawPath(path, linePaint)
}
}
|
